package com.example.myapplication1;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.widget.Toast;

import androidx.annotation.Nullable;

public class MyDatabaseHelper extends SQLiteOpenHelper {
    public static final String CREATE_USER = "create table userinfo ("
            + "id integer primary key autoincrement, " + "username text, " + "password text)";

    public static final String CREATE_CATEGORY = "create table Category ("
            + "id integer primary key autoincrement, " + "category_name text, " + "category_code integer)";

    private  Context mContext;

    public MyDatabaseHelper(Context context,String name, SQLiteDatabase.CursorFactory factory, int version) {
        super(context, name, factory, version);
        mContext = context;
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_USER);
        db.execSQL(CREATE_CATEGORY);
        Toast.makeText(mContext, "用户表创建完成", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("drop table if exists userinfo");
        db.execSQL("drop table if exists Category");
        onCreate(db);
    }
}
